A woman holds a sign as she attends a rally honoring Trayvon Martin organized by the National Action Network outside One Police Plaza in Manhattan on July 20, 2013 / Kena Betancur, Getty Images

by Yamiche Alcindor, USA TODAY

by Yamiche Alcindor, USA TODAY

A new anti-stand-your-ground advertisement features George Zimmerman's actual call to police moments before killing Trayvon Martin and a neighbor's 911 call that recorded screams and the fatal gunshot.

Coalition to Stop Gun Violence, a non-profit that advocates for changes in gun laws, released the public service announcement Monday and hopes it will motivate people to ask legislators to repeal stand-your-ground laws.

The video features Zimmerman being told he doesn't have to follow Trayvon as well as a frantic neighbor emotionally describing her experience to a dispatcher. The ad also shows a partial re-enactment of the shooting and several bodies lying on the ground with hoodies on much like how Trayvon came to rest.

"These are laws that are causing human tragedies, and that's what we are trying to show," said Ladd Everitt, communications director for the Coalition to Stop Gun Violence. "This is something that not only affected the Martin and Zimmerman families but those who either saw or heard the events unfold."

The video aims to take people into the night Trayvon was killed and personalize what Zimmerman, Trayvon and the neighbors saw and heard shortly before and after the shooting, he said. A website featuring the video allows people to sign a petition intended to ask lawmakers to repeal the laws.

Florida's stand-your-ground law states that a person does not have to retreat in the face of a threat and can use deadly force if fearing danger of death or serious harm. Dozens of other states have similar laws.

However, Zimmerman's lawyer Mark O'Mara has repeatedly said his client's case was a straightforward self-defense case and did not include stand-your-ground facts. O'Mara also decided against holding an immunity hearing before Zimmerman's trial.

"While the PSA uses actual audio from George's non-emergency call and witness 911 calls, the visual details of the re-enactment are wildly inaccurate and they are unsupported by the actual evidence," O'Mara said in a blog post Tuesday. "By airing an interpretation of events that are easily dismissed as factual fantasy, the proponents for changes in the self-defense statutes in various states are actually damaging their arguments."

Last month, a jury acquitted Zimmerman of second-degree murder and manslaughter charges in the February 2012 killing of 17-year-old Trayvon. Zimmerman, a Hispanic neighborhood watch volunteer, said he shot the black teen in self-defense after being attacked. State prosecutors said Zimmerman profiled and murdered Trayvon - then lied about initiating the fight.

Initially, stand-your-ground was cited as Zimmerman's defense, but O'Mara, when he took on the case, said Zimmerman was protected by traditional self-defense laws. Zimmerman could not have retreated, O'Mara said, because Trayvon was on top of Zimmerman striking the volunteer.

"The notion that stand-your-ground wasn't part of this case is an amazing piece of misinformation," Everitt said. "This is a guy who had every opportunity to avoid this confrontation and he precipitated it. He had every ability to retreat."

In an opinion piece published in The Washington Post Sunday, Benjamin Crump, an attorney for Trayvon's parents, urged people to sign a petition by his clients to amend stand-your-ground laws. He called for people to become "Trayvon Martin voters" and support changes to stand-your-ground laws, racial-profiling laws and stop-and-frisk policies.

Trayvon's parents have also publicly called on legislators to enact "Trayvon Martin amendments" that would bar an initial aggressor of a confrontation to fatally injure another person and claim self-defense.

"Passing these amendments would prevent this type of tragedy and protect others, especially children, from being profiled, pursued and killed by aggressors," Crump wrote Sunday in The Washington Post.